Battery box asphalt and method of making the same



Patented Dec. 7, 1948 other; molcled articles which have tux-meet-requirements for mechanical strength.

Battery boxes =for automobiles and :similar articles havebeenfmanufactured by moldingdiot "mixtures of asphalts iine fillers and'fibroustmaterials The following composition may be considered --typicalfIO l ba'ttcry;- boxes- Per cent Asphalt blend 52 Cotton'Fibres Up tonow, it has been the generahpractice in the industry wto sblendappreciable proportions of Gilsonite with blown asphalts in order tomake a box jhaving both toughness and hardnessyas well as goodmold-ability "and improved {appearance'. Thefusual asphalt-Gilso'n itebleii itafills as nuclras 30-40% *offGilspnite, a natural .iasphaltfoff'limite'd availability and highjicost. "Such practiceis reflectedinTUfS. Patent 1,752,917

to A. R. Lukens, assignor to the Richardson Compoundih i 1 "BATTERYBoner-mm Ann METHOD or MAKINGTH-E SAME.

- Walla-cc spaaousesasviiinsl Bocnau,Long Island City, N."Y., assignorsto- Socony-VacuflmDfl Company, cor orationnfliew York pany. To the bestof our knowledge, no asphalt of purely petroleum origin has met therequirements of cohesion and mechanical characteristics necessary in thebattery boxes.

We have found that oxidation of solvent extract tars from residualpetroleum oils, such as Duo- Sol tar, to a blown bituminous materialhaving a ring and ball softening point in the neighborhood of 250-300"F., preferably 275-285 F., yields products of unique characteristics.Such products are capable of replacing the Gilsonite-asphalt blends andeven surpassing them in quality.

A plant sized batch of Duo-Sol tar having the following physical testswas blown with air at 400 to 500 F.

Specific gravity 77/77 F. 1.012 Softening point (R. & B.) F 90 Flash,COC F 500 Viscosity furol 210 F -seconds 323 Penetration 32 F., 200 gr,60 sec 52 The properties of the resulting product were as follows:-

Softening point (R. & B.) F 279 Penetration 77 F., 100 gr., 5 sec 2Penetration 60 115 F., 50 gr., 5 sec. 2 /2 Penetration 150 F., 50 gr., 5sec 9 Experimental production results from a battery box manufacturer onthe above described new asphaltic material, in comparison with twoGilsonite-asphalt blends, are given below. Storage i'l ests .on Battery;Boxes:

Incorporated, a

battery boxes were all made inQthe same manner, s the e pr ti ns: qf bium epvs tte b r and 1 6 7410 va et er fi -i m dii? Welirindofgasphaltused. A .1

5 castration 150/50/5 at1on,per. ens 10 Product. H 03051; Piece/Impacta; mai s nd souli nqt ma i r li ll .nthis e sp W :no fi son i e i *blendwith m tro" S.P. Venezuelan asphalt,it was still harder to mold. It willbe noted that the box made with 100% blown Duo-Sol tar has a bettertensile strength, better impact resistance, and equal elongation,compared with the blend containing 40% Gilsonite. No difliculty inmolding was observed.

The test procedures used in obtaining characteristics of the batteryboxes are those described in the ASTM Standards for 1942, part III, p.1405, Testsrfor asphalt battery containers (D639-41T) and p. 1389, Testsfor hard rubber products (D530-39T).

The Duo-Sol tar is an asphaltic extract obtained by solvent refining ofreduced crudes with liquid propane and cresylic acid. Other extractsobtained similarly from residual petroleum oils by solvent refining withpropane, phenol, clorex and other selective solvents known to the artare suitable for the purpose of this invention provided the extract assuch, or after reduction by topping prior to'air blowing, conforms tothe following approximate characteristics:

Softening point (R. & B.) -JF. min Specific gravity 77/77 F min 1.00Penetration 32 F., 200 gr., 60 sec. 20 to 150 Viscosity furol 210 F.secs. to 750 V. G. C. min .890

The desirable properties of the oxidized asphalt suitable for directcompounding with the fillers 3 into the battery box material should bewithin the following limits:

Specific gravity 77/77 F -min.... 1.03 Softening point (B. 8: B.) ....F250-300 Penetration 77 F., 100 gr., 5 sec. to; Penetration 115 F., 50gr., sec 1 to 6" Penetration 150 F., 50 gr., 5 sec 5m 16 AS Pointed outhereinbefore, the preferred form of the product is one which has beenblown to a.

ring and ball softening point of 275 to 285 F.

We claim: 1. That method of making an asphalt suitable for use, togetherwith filler and fibre, in the production of molded battery boxes whichcomprises the following steps: solvent refining a reduced crude toproduce therefrom a solvent extract tar,

reducing said tar by distillation to a material of the followingproperties:

Softening point (R. a B.) F. min

and then oxidizing the reduced tar to an asphalt having the followingproperties:

Specific gravity 77/77 F min 1.00

' Penetration 32 F., 200 gr., 60 sec 20 to 150 Viscosity furol 210 F.secs 100 to 750 V. G. C min .890

y 2. That method of making'jan asphalt-suitable for use, together withfiller and fibre, in-theprqr duction of molded battery boxes whichcomprises l the following steps: solvent refining crude to producetherefrom a solvent extract tar, reducing said tar by distillation toing propertiesz' Softening point (R. & B.) F. min- Specific gravity77/77 F ..min

a material of the follow- 1 Penetration 32 F., 200 gr., 60 sec 20 to 150Viscosity furol 210 F. secs 100 to 750' v. G. c ---min .890

and then oxidizing the reduced tar to an asphalt having the followingproperties:

Specific gravity 77/77F min 1.03 Softening point (R. 8: B.) 1 F 275-285Penetration 77 F., 100 gr., 5 sec 0 to 4 Penetration 115 F., gr., 5 sec1 to 6 Penetration 150 F., 50 gr., 5 sec 5 to 16 3. An asphalticmaterial, suitable for the making of molded battery boxes when blendedonly with fibre and filler,'having the following properties:.

Specific gravity 77/77 F min 1.03 v Softening point (R. 81 B.) F 250-300Penetration @77" F., gr., 5 sec 0 to 4 Penetration F., 50 gr., 5 sec 1to 6 Penetration F., 50 gr., 5 sec 5 to 16 ,4. An asphaltic material,suitable for the mak- "mg of molded battery boxes when blended only withfibre and filler, having the following properties:

Specific gravity 77/77 F min.- 1.03 Softening point (R. 8: B.) F 275-285Penetration 77 F., 100 gr., 5 sec 0 to4 Penetration 115 F., 50 gr., 5sec '1 to 6 Penetration 150 F., 50 gr., 5 sec 5 to 16 WALLACE E.SPELSHOUSE. ARTHUR H. BOENAU.

REFERENCES CITED.

The following references are of recordin the file of this patent:

UNITED STATES PATENTS Date Number Name 2,068,845 Collins Jan. 26, 19372,073,088 Anderson et' a1 Mar. 9, 1937 2,144,694 Smith v Jan. 24, 19392,201,466 Anderson May-21, 1940 2,223,776 Anderson Dec. 3, 1940

